Tuning condenser mounting



Aug. 29, 1939. I G. J. BARRY 2,171,441

TUNING CONDENSER MOUNTING File d April 16, 193'! Patented Aug. 29, 1939 UNITED STATES PATENT OFFICE TUNING CONDENSER MOUNTING Gerald J. Barry, Philadelphia, Pa., assignor to' Philco Radio and Television Corporation, Philadelphia, Pa., a corporation of Delaware Application April 16, 193'J,'Seria1 No. 137,373

6 Claims. (01. 248-458) Another object of the invention is to provide 10 a novel mounting of this character which comprises interlocking parts for mounting the'tuning unit on a support or base free of mechanical attachment to the support, and which embodies a single mechanical attachment between the tuning 1 unit and a mounting element serving additionally to permit adjustment of the mounting of the tuning unit to bring the control shaft thereof into alignment with the opening in the radio cabinet.

' A further object of the invention is to provide 80 a novel mounting employing specially formed mounting elements which are adapted for the purpose in view. I

. Other objects and features of the, invention will appear more clearly hereinafter.

' 25 In the accompanying drawing:

Fig. 1 is a front elevational view of the condenser unit mounting;

' Fig. 2 is a side elevational view of the mountin 80 Fig. 3 is a fragmentary perspective view illustrating one of the front mounting feet of the device;

Fig. 4 is a perspective view of one of the resilient members employed; 85 Fig. 5 is a sectional view of a resilient member; Fig. 6 is a detail sectional view taken through the rear mounting of the device; and

Fig. '7 is a perspective view of the rear mounting member.

40 Referring to Figs. 1 and 2, there is shown a support or base I upon which the tuning condenser unit 2 is floatingly and adjustably mounted in accordance with the present invention. The support i and the tuning condenser unit I may 4.5 take any suitable forms, those illustrated being chosen merely for the purpose of disclosure. It will be understood, that the tuning condenser unit may include. other elements beside the tuning condenser itself. As conventionally formed, the

50 tuning condenser'unit comprises a frame 3 carrying a plurality of aligned condensers], in the present instance, two condensers being shown. It will be understood, of course, that the condenser unit may comprise any desired number 55 of tuning condensers. The condenser unit is provided with the usual control shaft 5 which is adapted to adjust the several condensers of the unit, as well understood, and there is also provided the usual shaft 5 whichis adapted to carry the tuning indicator or dial. When the radio re- 5 ceiver embodying the tuning condenser unit is assembled within the usual radio cabinet, the control shaft 5 is adapted to extend through an opening in the front wall of the cabinet in order that it may be accessible outside the cabinet. 10

The support or base i is preferably formed of sheet metal in the form of an inverted box, thus providing an elevated horizontal supporting panel.

It is desirable to floatingly mount the tuning unit of a radio receiver so as to isolate the said unit from vibration and thus avoid microphonics and undesirable vibration of the parts of the tuning unit which are sensitive to mechanical disturbanc'es. The commercial manufacture of such a floating mounting, however, requires broad tolerances in the mounting and makes it impossible to align the tuning control shaft exactly with the hole in the cabinet through which the shaft extends. By the present invention, there is provided a novel floating or resilient mounting for the tuning condenser unit and there is also provided means for adjusting the mounting of the unit to vary the position of the tuning control shaft and thus overcome the inaccuracies incurred by the required tolerances of manufacture above mentioned. Moreover, the mounting provided by the invention is extremely simple and easy to assemble and it reduces the cost of manufacture and assembly to a minimum.

In accordance with the invention, at the front end of the condenser unit, there is provided a transverse member I which is secured rigidly to the frame 3 in any suitable manner, for. example by means of rivets 8. The end portions of 40. member I are formed so as to provide mounting feet 8, one of which is clearly shown in Fig. 3. These mounting feet are of bifurcated or clawlike structure, as clearly illustrated, for a purpose which will appear presently.

A resilient member III, as shown clearly in Figs. 4 and 5, is adapted to fit over each of the front mounting feet 9. To this end, the resilient member II is recessed as clearly shown in Fig. 5 in order that it may fit over a mounting foot 9 and may receive the extending upper and lower arms'of the mounting foot. Further, as shown in Fig. 5, the resilient member I0 is formed so that there is a substantial thickness of resilient material below the upperrecess of the member.

The resilient member I0 is also provided with a slot II disposed as clearly illustrated. Each of the resilient members, which are shaped as illustreated and described, may be formed of any suitable material such as live rubber. These members may be manufactured in any suitable manner, for example by molding the material to the desired form following molding practices which are commonly employed.

The support or base I is provided with spaced openings which are adapted to receive the front mounting feet 9 with the resilient members I8 thereon, as shown in Figs. 1 and 2. These openings are of such size that the lower portions of the mounting feet 9 and the resilient members I0 fitted thereon may be inserted through the openings and the mounting feet then moved so as to cause the slots II to receive and-engage the edge portions of the base at the said openings. In this manner, the resilient mounting members are interlocked with the base free of mechanical attachment thereto. The substantial thickness of resilient material above the slot II of each resilient mounting member serves to amply cushion the front end of the tuning condenser unit with respect to the support or base. The cushioned front mounting feet also serve cooperatively with a rear mounting foot to prevent displacement of the supported unit as described below.

In further accordance with the invention, at the rear of the tuning condenser unit, there is provided a mounting member I2 formed as clearfly shown in Fig. '7. This mounting member is provided with a lug I3 which is adapted to seat in an elongated opening I4 provided in the rear wall of frame 3 as clearly shown in Fig. 6. The member I2 is also provided with an elongated opening I5 adapted to receive a screw I'E carried by the rear wall of frame 3 as shown clearly in are in place.

Fig. 6. It will be seen that by virtue of lug I3 and the screw I6, the mounting member I2 is held against lateral movement and, at the same time, the rear of the frame 3 may be adjusted vertically and held in adjusted position by means of the screw I6. A shake-proof washer I6a is preferably employed to prevent loosening of the screw after adjustment.

The mounting member I2 is also provided with a bifurcated foot portion "similar to the front mounting :feet 9 above described. Mounting foot I1 is likewise adapted to receive a resilient member I8 similar to the resilient members III. The support or base I is provided with an opening I9 which is adapted to receive the rear mounting foot I1 and the resilient member I 8 carried thereby, as illustrated in Fi 6, the slotted resilient member I8 being interlockable with the edge of the support or base at the opening I9.

The several openings in the support I for the mounting feet 9 and II are of suficient width to fit snugly against the sides of the resilient members III and I8. In this way, the tuning unit is -prevented from moving'sideways when viewed from the front. The length of the seveal openings is suflicient to permit the mounting feet to be inverted in them when the resilient members Toprevent forward or backward movement of the tuning unit, the front mounting feet 9 extend forward while the rear mounting foot 'I extends backward As'may be seen in Fig.6, there is a cushion of rubber between the support I and foot I1 which prevents the foot from moving to the left in the drawing. In the complete assembly the feet 9 prevent forward movement and the foot --II prevents rearward parts are completely disassembled, the resilient members I II are placed on the front mounting feet 9 and the resilient member I8 is placed on the rear mounting foot II. The mounting mem-.

ber II carrying the resilient member I8 is then inserted in the rear opening I8 and interlocked therewith, as illustrated in Fig. 6. To do this, the operator places the members I2 and I8 in the opening in a tilted position so that the left lower corner of the resilient member I8, as viewed in Fig. 6, is in the opening I9 and the front of the slot II is engaged with the left edge of the opening. In this position the member I2 is inclined toward the right and the bottom of the curved edge 20 rests against the right edge of the opening. By rotating the top of I2 clockwise about the left edge of the opening as an axis, the member will be forced to its proper position, the curved surface 20 sliding on the right edge of the opening and acting as a cam .surface to'urge the member to position. However, before this last step, the unit 2 is placed on the base of an angle (downward to the left in Fig. 2) and the front members I carrying resilient members I 0 are inserted and interlocked with the front openings following the same procedure; i. e., inserting at an angle and rotating to the proper position. In this operation, the curved edge 2I (Fig. 3) rides on the rear edge of the front opening and acts'as a cam surface to urge members I to position. The member its proper position as described above. (In Fig. 2 the top of member I2 is moved to the left.) This brings the rear wall of the frame 3 and the mounting member I2 into cooperative relation with the lug I3 extending into the opening I4. The screw I6 is then inserted through the opening I5 and is threadedly engaged with the rear wall of the con- I2 is then rotated to denser frame. The mounting is then completely assembled and, in order to align the tuning control shaft 5 with the opening therefor in the front wall of the'radio cabinet, it is merely necessary to slightly loosen screw I6 and raise or lower the rear of the tuning condenser unit. When the proper position of the unit is obtained, the screw I6 is tightened to maintain. the adjustment. When completely assembled, the edges 29 and 2I are free of contact with basev I.

It will be noted that the front and rear resilient mounting eements are interlocked with the support or base free of mechanical attachment thereto, the only attachment element employed in the device being thescrew I6 which serves to adjustably secure the rear of the tuning condenser unit to the rear mounting member I2. By virtue of this construction, the device is adapted for rapid assembly at low cost. Thus, the device lends itself particularly to modem mass production methods and it eflects a substantial saving in the cost of manufacture of a radio receiver. In fact, it has been found that this mounting reduces, by five or six, the number of manual operations heretofore required in the assembly of the tuning condenser mountings which have been employed. Moreover, by reducing the number of attachment elements to one, as compared to vention greatly facilitates the assembly process and effects s. further economy in production.

\ It will be noted-also that the invention provides a three-point resilient mounting for the condenler unit which isolates the unit mechanically from the support or base and thus eliminates any possibility of microphonics, particularly since the resilient members it and II provide the desired resilient yet rugged supporting cushion at each of the three mounting points. Furthermore, theinvention provides a very simple means for adjusting the position of the tuning condenser unit to obtain the required alignment of the tuning control shaft with the hole therefor in the front wall of the cabinet.

It will be understood, of course, that the invention has been illustrated and described with reference to a specific preferred form for the purpose of disclosure only, and that the invention is not limited to this specific form but is capable of various mcdiiicaticns as will be apparent in persons skilled in the art.

I claim:

1. Apparatus for mounting a timing eiement of a radio receiver or the like, comprising a supporting base having omnings therein, a tuning element unit, a mounting member having bifurcated feet carried by said unit at one end thereof, resilient members shaped to iit over said feet and adapted to intericci: with said base at said epen lugs to resiliently support said end, and means fer resiliently mounting the opposite end at said unit on said base,

2. Apparatus for mounting a tuning element M a radio receiver or the like, comprising a suppdrting base having epenings therein, a timing element unit, a iliiiitiiitilig member leaving interested feet carried by said unit at ens thereof, rent lent shaped to ever said an having pcrtiens adapted a the edge of said at some ei said i airings resiliently sn p et said end, a mean-ting like: having a bifurcated parties, a resident member shaped to ever said pcrticn and a slotted pcrtiori adapted to interieek with the edge of said base at ancther at said openings be re iently support said last-mentioned mounting member, and means for mechanically attaching said last-menticned mounting member ta the opposite end of said unit.

3. A mounting for a unit oi a radio receiver or the like, comprising a supporting having openings therein, a mounting member having an extending bifurcated foot and a recessed resilient 55 element thereon adapted to interlock with said base at one of said openings, a mounting member on said unit having an extending bifurcated foot and a recessed resilient element thereon adapted member to the said appetite er toifiterlock with said base at another of said openings, and mechanical attachment means for attaching said first-mentioned mounting member to said unit.

4. A mounting for a unit of a radio receiver or the like, comprising a supporting base having openings therein, a mounting member having an extending claw-like foot and a resilient element thereon insertable in one of said openings in interlockinprelation with said base, said member having a cam face adapted to engage an edge of said ope to urge said member into position, a mounting member on said unit having an extending claw-like foot and a resilient element thereon insertabie in another of said openings in interlocking relation with said base, said lastmentioned member having a cam surface adapted to engage an edge of said other opening to urge said member into position, and mechanical attachment means for attaching said first-mentioned mounting menimr to saidunit.

5. Apparatus for insulating a. tuning unit of a radio receiver or iike, cemprising a suppcrting base, a tuning unit including a tuning condenser having at least one extending shaft adapted to be inserted in a waii opening of a receiver cabinet, resilient means at the end at said unit from which said shaft extends having bifurcated feet interlockable with said support to resiiiently support said end, a mounting member carrying resilient ineans'hav ing bifurcated feet interioclcabie with said support at the oppcnte cf said unit tc resiiiently support said inc-u ng member, and means for ads'ustebly attache said mounting ei said unit to permit variation oi positisn to align the shaft said 6. Apparatus fer meant radio receiver or the like, i tease having open; eluding a tuning es extending shaft opening of a receit s ried by said unit at it least ed in a wait feet careni which said shaft extends, resilient i3; maped te it over said feet having bcrtiens adapted to interleciz with the eds base at some of said openings ta resiliently s pport said end, a mounting member having a bifizlrcated portion, a resilient mem er shaped t0 over said portion and having a slotted portie-n adapted to interlock with the edge of said base at another of said openings to resiliently support said mounting member, and means for adjustabiy attaching said mounting member to the opposite end of said unit to permit variation of the position of said shaft so as to align the shaft with said wali opening.

- I GERALD J. BARRY. 

